<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../../UI/vue/vue.js"></script>
    <style>
        .basic {
            width: 400px;
            height: 100px;
            border: 1px solid black;
        }

        .happy {
            border: 4px solid red;
            ;
            background-color: rgba(255, 255, 0, 0.644);
            background: linear-gradient(30deg, yellow, pink, orange, yellow);
        }

        .sad {
            border: 4px dashed rgb(2, 197, 2);
            background-color: gray;
        }

        .normal {
            background-color: skyblue;
        }

        .a1 {
            background-color: yellowgreen;
        }

        .a2 {
            font-size: 30px;
            text-shadow: 2px 2px 10px red;
        }

        .a3 {
            border-radius: 20px;
        }
    </style>
</head>

<body>
    <div id="root">
        <!-- 绑定class样式--字符串写法，适用于：样式的类名不确定，需要动态指定 -->
        <div class="basic" :class="mood" @click="changeClass">{{name}}</div><br><br>
        <!-- 绑定class样式--数组写法，适用于：要绑定的样式个数不确定、名字也不确定 -->
        <div class="basic" :class="arr">{{name}}</div><br><br>
        <!-- 绑定class样式--对象写法，适用于：要绑定的样式个数确定、名字也确定，但要动态决定用不用 -->
        <div class="basic" :class="classObj">{{name}}</div> <br /><br />
        <!-- 绑定style样式--对象写法 -->
        <div class="basic" :style="styleObj">{{name}}</div> <br /><br />
    </div>
    <script>
        Vue.config.productionTip = false //阻止 vue 在启动时生成生产提示。
        const vm = new Vue({
            el: '#root',
            data: {
                name: 'test',
                mood: 'normal',
                arr: ['a1', 'a2', 'a3'],
                classObj: {
                    a1: false,
                    a2: false
                },
                styleObj:{
                    fontSize:'40px',
                    color:'red',
                    backgroundColor:'orange'
                }
            },
            methods: {
                changeClass() {
                    const arr = ['happy', 'sad', 'normal']
                    const index = Math.floor(Math.random() * 3)
                    this.mood = arr[index]
                }
            },
            computed: {

            },
        })
    </script>
</body>

</html>